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对10个籼稻品种营养器官镉积累特性的遗传差异及其与稻米镉含量的关系进行了研究。试验结果表明,水稻各器官的镉富集能力在不同品种间存在显著差异,变异系数为25.34%~45.40%;成熟期各器官的镉积累量依次为:根系>叶片>穗轴>籽粒。通过通径分析发现,穗轴中的镉浓度对稻米镉含量的影响最大,根系中的镉浓度和叶片中镉的输出量共同决定着穗轴中的镉浓度。喷施或涂抹镉溶液都能显著提高水稻叶片中的镉含量,喷施3次能显著提高叶片中的镉输出量和稻米中的镉含量,旗叶对稻米镉含量的贡献率显著大于倒二叶和倒三叶。这说明通过大气沉降进入叶片的镉和污染土壤中的镉都会对稻米中的镉积累量产生显著影响。
The genetic differences of cadmium accumulation in vegetative organs of ten indica rice cultivars and their relationship with cadmium content in rice were studied. The results showed that there was a significant difference in the cadmium accumulation ability of different organs in different organs of rice. The coefficient of variation was 25.34% ~ 45.40%. The accumulation of cadmium in different organs at maturity was: root> leaf> cob> grain. Through the path analysis, it was found that the cadmium concentration in the cob had the greatest impact on the cadmium content in rice. The cadmium concentration in the root system and the cadmium output in the leaf jointly determined the cadmium concentration in the cob. Spraying or applying cadmium solution could significantly increase the content of cadmium in rice leaves. Spraying three times could significantly increase the cadmium output in leaves and the content of cadmium in rice, the contribution rate of flag leaves to the content of cadmium in rice was significantly greater than that in the second place Leaves and inverted clover. This shows that cadmium entering the leaves by atmospheric deposition and cadmium in contaminated soils can have a significant impact on the amount of cadmium accumulated in rice.